带有损伤杆件的钢管结构极限承载力计算的实用力学模型  

A practical mechanical model for the analysis of ultimate strength of dent-damaged tubular structures

作　　者：张猛[1] 李天[1] 张哲[1] 张凯[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450002 [2]同济大学建筑工程系,上海200092

出　　处：《空间结构》2007年第4期19-24,共6页Spatial Structures

基　　金：国家"十五"科技攻关项目(2002BA806B-4-3);河南省教育厅自然科学基金资助项目(20015600011)

摘　　要：采用有限元计算和试验数据建立的回归模型方法来研究一般受损条件下轴心受压圆钢管杆件受力的全过程.分析了凹陷深度、初弯曲、长细比和截面径厚比等参数对杆件极限承载力的影响.重点研究了上述参数对杆件荷载—轴向缩短关系的单独影响和综合影响.最后引入了受损杆件的折算刚度系数,为带有损伤杆件的钢管结构极限承载力的非线性分析提供了合理的力学模型.This paper studies the whole behavior of dent-damaged tubular members with the help of a regression model, which was developed from published test results and finite element analysis. The parameters including dent-depth, initial crookedness, slenderness ratio and diameter-thickness ratio are considered and their influence on ultimate load is analyzed. Both separate influence and combined influence of the above parameters on load-shortening relationship are discussed. Finally, a coefficient of the equivalent stiffness of compression dent-damaged tubular members is derived, which provides a suitable mechanical model for the nonlinear analysis of ultimate strength of dent-damaged tubular structures.

关 键 词：圆钢管杆件 极限承载力 回归模型 凹陷损伤 荷载-轴向缩短关系 折算刚度系数 

分 类 号：TU392.3[建筑科学—结构工程]